Chain saw



Oct. 11, 1960 A. WENSLOFF 2,955,628

CHAIN SAW 7 Filed March 51, 1959 Fig.

Allen wens/off INVENTOR.

BY WW UnitedStates Patent '0 A sxw' Allen Wensloif, Rte. 2, Roseau, Minn.

Filed Mar. 31, 1959, Ser. No. 803,160

Claims. (Cl. 143-32) This invention relates to new and useful improvements in portable chain saw machines of the type comprising an endless cutting chain driven by an internal combustion engine and has for its primary object to provide, in a manner as hereinafter set forth, a machine of this character comprising novel means for heating or warming both of the usual handles which are gripped by the operator.

Another important object of the present invention is to provide a portable chain saw machine of the aforementioned character which embodies unique means for regulating or controlling the handle heating means.

Another important object of the invention is to provide a handle heating means for portable chain saws which may be expeditiously installed on conventional machines which are already in use without the necessity of materially modifying such machines.

Other objects of the invention are to provide an improved chain saw machine of the character set forth which .will be comparatively simple in construction, strong, durable, compact, of light weight and which may be manufactured at low cost.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which: I

Figure 1 is a top plan view of a portable chain saw machine provided with handle heating means embodying the present invention;

Figure 2 is a view in side elevation thereof with portions of the handles broken away in section;

Figure 3 is a vertical sectional view through the control or regulating valve; and

Figure 4 is a view, partially in section, showing a modification. l

Referring now to the drawing in detail, it will be seen that reference character 5 designates generally a portable chain saw machine comprising the usual endless cutting chain 6 driven by an internal combustion engine 7. The engine 7 receives fuel from the tank 8. Extending rearwardly from the tank 8 is a hollow or tubular throttle handle 9. Extending transversely over the front of the machine 5 is a tubular lifting handle 10.

Mounted on or in the vicinity of the usual muffler 11 of the engine7 is a substantially inverted cup-shaped manifold 12 of suitable metal. The manifold 12 is secured by screws 30 on a washer or spacer 13 which, in turn, is secured by screws 31 on the mufiier 11. These joining surfaces are necessary for easy removal of the vmufiier 11. Interposed between the washer or spacer 13 and the muffler 11 is a sealing gasket 14. Fixed in the ,rwasher or spacer 13 and extending downwardly therefrom into the mufller 11 for receiving hot exhaust gases therefrom is a pipe 15. The pipe 15 extends into the engine side of those mufllers having multiple chambers.

ice

A tube 1 6 extends from the manifold 12 to the forward or inner end portion of the throttle handle 9. A suitable supporting bracket or clamp 17 secures the rear end portion of the tube 16 to the fuel tank-8. Extending between the manifold '12 and the adjacent end poris the stem 19 of a regulating valve 20. A valve member or head 21 is fixed on the lower end of the stem 19 for operatio'n in the manifold 12. When in closed position, the valve member or head 21 is adapted to seat on the upper end of the pipe 15. An operating handle 22 is mounted transversely in the upper end portion of the stem 19. A lock nut 23 on the stem 19 secures the valve 20 in adjusted position.

It is thought that the operation of the invention will be readily apparent from a consideration of the foregoing. Briefly, with the engine 7 in operation and the valve 20 in open position, hot exhaust gases from said engine flow upwardly into the manifold 12 through the pipe 15. From the manifold 12 the hot exahust gases flow through the tubes 16 and 18 into the adjacent end portions of the tubular handles 9 and 10, respectively. The hot exhaust gases flow through the handles 9 and 10 and are discharged to the atmosphere through outlet openings 24 and 25 of a predetermined size in the other ends thereof, thus heating or warming said handles in an obvious manner. Of course, the volume of exhaust gases entering the tubes 16 and 18 to the handles is controlled or regulated by the valve 20. If more heat is needed in either handle, the outlet opening of that handle is enlarged, making further adjustment unnecessary. This is done at the time of installation.

In the modification of Figure 4 of the drawing, reference character 26 designates a solid throttle handle. Secured longitudinally on the handle 26 by screws 27 is a stove 28. The tube 16 from the manifold 12 is con nected to the inner end portion of the stove 28. The other end of the stove 28 is provided with an outlet opening 29.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. For use on a portable power chain saw machine of the type comprising an endless cutting chain, an internal combustion engine operatively connected thereto and provided with an exhaust muffler and remotely positioned throttle and lifting handles, at least said lifting handle being tubular; an accessory including heating means for the handles comprising a hollow manifold, a pipe extending from the interior of said manifold outwardly therefrom, means on said manifold adapting the latter for securement to said exhaust muffler over an opening formed therein, with the outer end of said pipe projecting into said mufiler through said opening, a pair of tubes each having one end secured to said manifold and communicating with the interior thereof and the inner end of said pipe, means on the other ends of said tubes adapted for securement to said handles for heating the latter with the exhaust gases from said internal combustion engine, and valve means secured to said manifold and engageable with the inner end of said pipe for controlling the flow of exhaust gases to said handles.

2. The combination of claim 1 including a hollow stove secured to the other end of one of said tubes adapted for securement to said throttle handle in over- Patented Oct. 11,1960- lying relation vvith ooriions thereof for heating said 4. The combination ofclaim, I wherein said'throttle handle is tubular and the other ends of said tubes communicate with the interiors of said tubular handles.

5. The combination of claim 1' wherein said valve means simultaneously controls the flow of the exhaust 10 gases through both of said tubes.

570,441 Pennington Oct. 27, 1896 1,237,231 Wilson et a1. Aug. 14, 1917 2,843,164 Marsh July 15, 1958 l FOREIGN PATENTS l 728,467 France Apr. 12, 1932 

